Hi kris, welcome to the site. We've just moved over from our old website so some things are still a little un-organised here but it's coming together quickly. If you were interested in some more information on samatha jhanas, here are some great practical guides from the old site:
Jhana and NanaDeeper in Jhana[url=http://dharmaoverground.wetpaint.com/page/The+Arupa+(immaterial)+Jhanas]The Arupa (immaterial) Jhanas
Simple instructions for attaining concentration jhanas 1 to 8If you have any more specific jhana-related questions, I hear Trent has just put up an offer to answer all and everything regarding concentration practice!
Take a look.
I don't think we have many people here experienced in the Tibetan traditions, but I may be wrong.
P.S. I moved your thread from the "Claims to Attainment" section to the Tibetan section, as this is a question about a particular tradition rather than a claim to attainment.